Clutch and stop mechanism



v R. L. LYONS CLUTCH AND STOP MECHANISM Filed July 5, 1927 Mfg/7091' M MM2250:

Jan. 22, 1929. 1,699,796

\ R. L. LYoNs CLUTCH AND STOP MEGHANISM Filed July 15, 1927 2sheets-sheet 2 Patented Jeun 22, 1929.

ir stars PATENT OFFICE..

ROBERT L. L`SCOI\T":.,` OF WAL'IHAM, MASSACHUSETTS, ASSIGNR TO FREDERICKOSANN CMIE'ANY, 0F NEW YORK, Nj. Y., A GRPORATIN 0F NEW YORK.

`insurer: AND sror ivrnoHAivrsM.

`Application filed July A. clutch and stop mechanism particularlysuitable lor controlling high .speed light unan chinos comprises a drivepulley journaled on the driven shaft, and slidable axially to and from aposition in which a; driving` lag thereon is in driving relationtoalugon the shaft. For controlling the axial positionof `the pulley thereis provided a rockable member,

which, when rocked to position tohold the pulley ont of driving arialrelation, inter poses a stop to the rotation ol the shalt. ldhiile thismechanism quite satisfactory in operation tor the particular serviceintended, it does `not permit turning the machine over by hand Withoutoperatively disconnecting the power him the. drive `pulley since rockingot the stop out of stopping relation so that the shaft maybe turned atonce moves the pulley into driving position.

'.lhe present invention, tlreredore, `has for its object tojproo'ideamechanism of this general type so designed that tniay be placedat willinto a condition permitting the shaft to be `rotated by hand and `to bereturned readily to its normal operative con For this purpose au secondloose i,

own driving pulley in condition 1to1 shiill'ted back to the drivingpulley ot the clutch mechanism whenever desired. c For a more completeunderstanding i of this invention, reference may be had totheaccompanying drawings in which Figure l is a fragmentary `side elevationol" a serving machine showing lthe mechanism applied thereto. i

Figure 2is a rear `elevation thereof;

Figure 3 is a diagrammaticA detail showing'.

successive positions of the control and stop ineniiber relative to theshaft and drivinglug;

Figures l and 5 are toipfplans of the mechanism shown in stopped anddriving `positions, respectively.` z-

1927. serial No. eos-,018.

Figure 6 is a. lragmentary perspective showing the `driving connections.

Figure 7 is a section to an enlarged scale on line 7"-7 otFigure 4L.

Referring to these ligures, l indicates a portion ot' the frame of asewing machine, though it should be understood that the mechanism is asapplicable'to `any other light high speed machine, this machine having arotary driving shalt 2 journaled therein and suitably connected tooperate the sewing or other operative instrumentalities. The shaft 2 hasjournaled thereon, Wit-h capability ot axial movement, a belt pulley 3.This belt pulley, as shown best in Figure 7, is provided with anextended `hub port-ion 4 on one side,

terminating in a reduced threaded portion on which may be engaged agrooved cam pulley 6. rlhis grooved pulley serves to retain in positionon the hub portion d `and Aidle pulley 7, which isfreely journal'ed onthe hub portion. `The outer end of the shaft 2 may be provided With `ahand Wheel 8 by which it may be turned manually. On the `opposite sideof the pulley 3` from its hub portion l the shaft 2 has xed thereon adrive and stop lug l0. This lug l() projects radially from the sha-tt 2in position to be engaged by the head ll of a bolt l2 extending"throughthe pulley 3 whenever the pulley 8 isf in an axial positionadjacent thereto. The bolt l2 is shown as held inl position in thepulley 3 `bynueans of a nut le engaging its inner threaded end, and inorder to proyide for free rotation of the pulley 7 it isoprovided Wirthan annular groove or channel 15 in oneface Within which the nut 14` mayAfreely ride. y l

In order to control the axial position oit the pulley 3` so as to bringits drive lug ll intoand out of driving-relation with the `shaft lug l0,a cani elementhaving i cam face 2lengag1ng Within the groove off 24,this collar 2d being `lixed as bynieans` of a set screw 25 to a roclshaft 26. The cam face 2l is arranged at an angle to the perpendicularto the shaft 2 so that as this member is rocked byrocking ol the shaft2d,

it moves the pulley 3 axially of the shaft 2 so as to bring the drivelug 11 into or out of driving relation to the s aft lug l de pending onthe direction of rocking of this member.

The shaft lug is also employed as one element of a stop mechanism sothat When the drive pulley 3 is out of driving relation thereto, the lug10 may be engaged by a stop element to stop t-he rotation of the shaft 2in a definite angular position. As shovvn in Figures 3, 4 and 5 the stopelement comprises a member also fixed to therock shaft 26, as by meansof a set screw 31, and having a socket at its outer end Within Which ispositioned a cushioning spring 32. This stop element 30 lies in theplane of rotation of the shaft lug 10 so that when `the rock shaft 26 isrocked in one direction, its end portion containing the spring 32 willlie in the path of rotation of the shaft lug l() which will impinge onthe spring 32 and its rotation be stopped. When in this stoppingposition (shown by dotted lines in Figure 3 and in Figure 4) the cammember 2O is in such a position that the driving lug `comprising thebolt head 1l carried by the pulley 3 is out of driving relation to thelug 10, and when the rock shaft 26 is rocked to remove the stop 30 fromthe path of motion of the lug 10 (as shovvn in full lines in Figure 3and in Figure 5), the cam 20 moves thepulley 3axially to bring it intodriving relation to the lug 10. It will thus be seen that whenever thestop is in operative position the drive pulley 3 is out of clutchingengagement to the shaft 2, and when the stop lug `is out of stoppingposition the pulley 3 is in driving relation to the shaft 2. As long,therefore, as the driving pulley 3 is being rotated by its driving beltshown at 35, it is impossible to `remove the stop element so that theshaft 2 may be turned Without causing this shaft to be connected to thedrive pulley so as to be driven thereb By shifting the drive belt 35,lioW- ever, rom the pulley 3 to the pulley 7, the pulley 3 is no longerAdriven and even though this pulley be moved into position so that itsdriving lug is in driving relation to the shaft lug 10, the shaft 2 maybe turned by hand by engaging the hand Wheel 8.

Referring to Figures 1, 2 and 6, it will be seen that the drive pulleybelt 35 passes down through suitable `openings in a table 36 on whichthe machine is mounted, about a pair of idler pulleys 40 therebeneath,and about a pulley 41 on a power countershaft 42. By the provision ofthe pulley V7 of substantially the same diameter as the pulley 3 andwith its belt face substantially a continuation ofthe belt face of thepulley 3, the belt 35 is held in operative relation to the pulleys 4()and 41 at all times. This is important for the reason that if the belt35 were merely removed from the pulley 3 Without being properlysupported by the pulley 7, it Would become disengaged from the pulley41, and as this is positioned beneath the Work table it might be adifficult matter tothereafter engage it with the pulley 41 when it Wasdesired to resume operation of the machine With the belt 35 on thepulley 3. By reason of the loose ulley 7, therefore, the proper relationofp the belt 35 to its drivin pulley 41 is maintained and at the sametlme the shaft 2 may be turned over by hand,.the `stop 30 being swungout of stopping relation and the pulley 3 moved to its axial positionWhere it is in driving relation tothe shaft 2.

Having thus described an embodiment of this invention it should beevident to those skilledin the art that various changes andmodifications might be made therein Without departing from its spirit orscope as defined by the appended claims.

I claim:

1. A device of the class described comprising a rotary shaft, a drivelug on said shaft, a belt pulley journaled on said shaft and movableaxially thereof, a lug on said pulley movable by the axial motion ofsaid pulley into and out of driving relation to said shaft lug, a stopmovable into and out of shaft-stopping position, means for moving saidpulley axially as said stop 1s moved to bring said shaft intoshaft-stopping position as said `pulley is moved out of driving positionand to move said pulley into` driving position as said sto 1s moved outof stoppin position, and a eely rotatable second pul ey adjacent to saidfirst pulley and out of driving relation therewith and on to which thebelt may be shifted from said belt pulley.

2. In a device of the class described comprising a rotary shaft, a beltpulley journaled on said shaft, means for positively stopping therotation of said shaft, means actuable` to render said stopping meansinoperative and to couple said shaft to the pulley` to `cause said shaftto be `driven by said pulley, and a loose pulley to which the drivingbelt of said pulley may be shifted when 1t is desired to render saidstopping means inoperative without causing said belt to rotate saidshaft.

3. A device of the class described compris# lilfl lill Said belt pulleyis in one axial position,` a sition'when said stop lug is in said pathand stop lug movable into and out of Jalle path to cause said drive lugto be in driving roof rotation of said shaft lug, and a member tationwhen said stop lug is out of said path. l0 movable with said stop lugand engaging In testimony whereof I have affixed my Within the groove ofsaid grooved pulley to signature. i i

control the axial position of said pulleys, to i A y cause said drivelug to be out of driving po- ROBERT L. LYONS.

